The Slumber Party Massacre is a 1982 American slasher film directed by Amy Holden Jones and written by Rita Mae Brown. In the film, an 18-year old is left alone by her parents and plans on celebrating a slumber party with her invited friends, not knowing that a murderer using a power drill has been unexpectedly invited and begins a killing spree.

The film was originally written as parody of the slasher genre, however, when it was submitted to the filmmakers, they filmed it not as a parody, but a straight genre film. As a result, the movie displays a lot more humor, both intended and unintended, than others of this genre. When originally released, the film received negative reviews, but later developed a cult following in the years.

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Trish Devereaux (Michelle Michaels), an 18-year-old high school senior, decides to throw a slumber party while her parents are away for the weekend and their neighbor Mr. Contant (Rigg Kennedy) is given the job of checking in on the girls during the night.

Trish wakes up to the sound of her radio, switches it to another channel, gets dressed, discards her old toys in a paper bag and puts it in the trash can, shortly before heading to school. Meanwhile, a mass murderer with a fondness for power drills, Russ Thorn (Michael Villella) has escaped from prison, kills a telephone repair woman (Jean Vargas) with a power drill and steals her van. Trish meets up with her friends Kim (Debra Deliso), Jackie (Andree Honore) and Diane (Gina Hunter) and the girls on her basketball team. The new girl, Valerie Bates (Robin Stille) is invited by Trish, but refuses after hearing Diane talking cruelly about her.

Russ Thorn watches the girls leave school from the van and a girl named Linda (Brinke Stevens) goes back inside the school to retrieve a book for a test, only to be locked inside and attacked by Thorn, who drills her right arm. She eventually hides in the shower room, but the killer somehow finds a locked door, drills it down and kills Linda.That evening, the party and the bloody decimation begins of the girls, as they smoke pot and talk about boys. Valerie lives next door and is babysitting her younger sister Courtney (Jennifer Meyers) while their divorced mother is away for the weekend. Diane's boyfriend John (Jim Boyce) and two other guys from school, Jeff (David Millbern) and Neil (Joe Johnson), arrive and spy on the girls undressing. Thorn kills Mr. Contant, drilling through his neck, and meanwhile, Courtney is begging Valerie to go crash the party, but Valerie protests. Diane begins making out with John in the car and after she gets out to ask Trish permission to go off with John, she comes back to find him decapitated. Diane tries to flee, but is murdered with his drill.

While the girls are on the phone with their coach, Mrs. Jana (Pamela Roylance), the pizza guy is shown with his eyes drilled out. Coach Jana hears the girls screaming and calls Valerie to check on them and decides to drive over to the house to check on them. The girls try calling the police, but Thorn cuts the phone line before they are connected. The teens arm themselves with knives and Jeff and Neil try to run for help, but are gorily killed by Thorn. Russ gains entry to the house, murders Jackie and chases Kim and Trish upstairs. Courtney and Valerie go over to the house, but find the house dark, unaware of the horror that has happened. Trish and Kim have barricaded themselves in Trish's bedroom. They hear Valerie, but ignore her, thinking she may be the killer's friend. Thorn, unexpectedly enters the bedroom through a window and disarms Kim, stabbing her with her own knife and causing Trish to flee and hide.

Courtney and Valerie enter Trish's house and find Kim dead. Thorn attacks them and Valerie escapes to the basement while Courtney hides under the couch. Coach Jana arrives and seeing the killer, beats him with a fireplace poker, but quicky murders her. Trish manages to stab Thorn with a butcher knife, but barely slows him down. Valerie runs up, armed with a machete and chases Thorn out the back door, causing her to sever Thron's drill bit and his left hand and finally slashes him, forcing him into the swimming pool. A shaken Courtney, Valerie and Trish embrace but Thorn arises and attacks the girls. After a struggle between the two, Thorn is seemingly killed when he is accidentally impaled on the machete.

During the aftermath, Valerie and Trish break down into tears upon killing Thorn and Courtney looks on as police sirens are heard in the distance, arriving in time and leaving the girls' fates unknown.

Written by author and feminist activist Rita Mae Brown, the film was intended as a parody of the slasher film. Producers filmed it not as a parody, but a straight genre film. Because of this, the film contains more humor than other slashers of the time period.[1]

Amy Holden Jones wanted to direct and asked Frances Doel for advice. She gave Jones a number of scripts one of which was Don't Open the Door. She saw the first eight pages had a dialogue scene, a suspense scene and a violent action scene, and decided to film them. Her cinematographer husband Michael Chapman got some short ends of film for her and they borrowed some equipment, hired some actors and shot the scenes at their house over a weekend for $1,000. She showed the result to Corman who agreed to finance the film. Jones had to turn down a job editing E.T. as a result.[2]

The film has been released on DVD three times in North America. The first release came from New Concorde Home Entertainment in September 2000. Extras included actor bios along with trailers for Slumber Party Massacre, Slumber Party Massacre II and Sorority House Massacre II.[4] The company subsequently re-released the film on a double feature DVD alongside Slumber Party Massacre II in July 2003.[5] These versions are both currently out of print. On 5 October 2010 Shout! Factory released Slumber Party Massacre, Slumber Party Massacre II and Slumber Party Massacre III on a two-disc special edition DVD set.[6]

Shout Factory under their Scream Factory label released the Slumber Party Massacre on Blu-ray on March 18th, 2014.

In the UK the film was originally released on VHS under the name Slumber Party Murders, but was then released with the Massacre title on DVD. In the UK it has had two releases to DVD, with both editions not containing any special features. The most recent edition was released by Matrodome Entertainment under the company IN2Film.